WO2020026923A1 - Matériau insonorisant stratifié - Google Patents

Matériau insonorisant stratifié Download PDF

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Publication number
WO2020026923A1
WO2020026923A1 PCT/JP2019/029060 JP2019029060W WO2020026923A1 WO 2020026923 A1 WO2020026923 A1 WO 2020026923A1 JP 2019029060 W JP2019029060 W JP 2019029060W WO 2020026923 A1 WO2020026923 A1 WO 2020026923A1
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Prior art keywords
layer
sound absorbing
absorbing material
sound absorption
fiber
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PCT/JP2019/029060
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English (en)
Japanese (ja)
Inventor
貴之 服部
秀実 伊東
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Jnc株式会社
Ｊｎｃファイバーズ株式会社
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Publication of WO2020026923A1 publication Critical patent/WO2020026923A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped

Definitions

  • the present invention relates to a sound absorbing material having a laminated structure in which a fiber layer and a foamed resin layer are combined.
  • a sound absorbing material is a product having a function of absorbing sound, and is frequently used in the field of construction and the field of automobiles. It is known that a nonwoven fabric is used as a material constituting a sound absorbing material.
  • Patent Document 1 discloses a multilayer article having a sound absorbing property including a support layer and a submicron fiber layer laminated on the support layer, wherein the submicron fiber layer has a central fiber diameter of less than 1 ⁇ m. Further, it is disclosed that the average fiber diameter is in a range of 0.5 to 0.7 ⁇ m, and the fiber is formed by a melt film fibrillation method or an electrospinning method.
  • a polypropylene spunbond nonwoven fabric having a basis weight (basis weight) of 100 g / m 2 and a diameter of about 18 ⁇ m is used as a support layer, on which a basis weight of 14 to 50 g / m 2 and an average fiber diameter of about 0 are provided.
  • a laminated article in which .56 ⁇ m submicron polypropylene fibers are laminated is disclosed.
  • the basis weight 62 g / m on a polyester card processing web 2 and a basis weight of 6 ⁇ 32 g / m 2 the multilayer article is disclosed as a laminate of electrospun polycaprolactone fibers having an average fiber diameter of 0.60 ⁇ m Have been.
  • the multilayer articles made in the examples were measured for sound absorption properties and were shown to have better sound absorption properties than the sound absorption properties of the support alone.
  • Patent Document 2 discloses an organic polymer foam having a laminated structure for improving acoustic comfort (reduction and optimization of a sound reflection component) and thermal comfort, and having a specific range of open porosity as a support layer. And a glass fabric having a specific airflow resistance as a surface layer, and a discontinuous adhesive layer between the support layer and the surface layer.
  • the organic polymer foam include those based on polyurethane, particularly polyester urethane, neoprene (registered trademark), silicone or melamine.
  • the density is preferably 10 to 120 kg / m 3 , Is preferably 1.5 to 2.5 mm.
  • Patent Document 3 discloses a multilayer sheet used as an insulator for an automobile.
  • the multilayer sheet of Patent Document 4 is one in which a first porous sheet and a second porous sheet are fused and integrated by a polypropylene meltblown nonwoven fabric inserted therebetween.
  • Examples of the first porous sheet and the second porous sheet include an adhesive entangled nonwoven fabric sheet of short fibers, a glass wool mat sheet, and the like, and a dense, low-permeability polypropylene meltblown nonwoven fabric therebetween. insert.
  • melt-blown nonwoven fabric having an average fiber diameter of 2 ⁇ m or less, the dispersion of the fibers is uniform, and the low-permeability physical properties of the meltblown nonwoven fabric can be inherited even when melted during molding.
  • an object of the present invention is to provide a sound absorbing material that has excellent sound absorbing properties in a low frequency region, a medium frequency region, and a high frequency region, and also has excellent space saving.
  • the inventors have repeated studies to solve the above-mentioned problems.
  • the laminated sound absorbing material including the base material layer and the fiber layer, a plurality of dense fiber layers having a specific range of fiber diameter and basis weight, and a foam having a certain thickness and density located therebetween.
  • the inventors have found that the above problem can be solved by adopting a structure including a sparse substrate layer which is a resin layer, and completed the present invention.
  • a laminated sound absorbing material including at least two fiber layers and a base material layer located between the fiber layers, Each of the fiber layers is made of fibers having an average fiber diameter of 500 nm or more and less than 5 ⁇ m, a basis weight of 10 to 500 g / m 2 , and an air permeability of 950 ⁇ m / Pa ⁇ sec or less, The thickness is less than 2.9 mm,
  • the base material layer is a layer made of a foamed resin, has a thickness of 2.9 to 20 mm, and a density of 5 to 30 kg / m 3 .
  • Laminated sound absorbing material is a laminated sound absorbing material.
  • the fibers forming the fiber layer are made of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, nylon 6,6, polyacrylonitrile, polystyrene, polyurethane, polysulfone, and polyvinyl alcohol
  • the material according to any one of [1] to [4], wherein the base material contained in the base material layer is a foamed resin made of at least one selected from the group consisting of a urethane foamed resin and a melamine foamed resin.
  • the fiber layer and the base material layer of a specific configuration in the laminated sound absorbing material by having the fiber layer and the base material layer of a specific configuration in the laminated sound absorbing material, it is possible to realize high sound absorbing properties with a small number of layers, and as a sound absorbing material.
  • the thickness can be reduced.
  • a sound absorbing material having excellent sound absorbing characteristics in a low frequency region, a medium frequency region, and a high frequency region can be obtained.
  • the laminated sound absorbing material of the present invention has a sound absorption characteristic peak in a region lower than that of the conventional sound absorbing material, and is excellent in sound absorbing performance in a region of 2000 Hz or less, particularly in a region of 1000 Hz or less.
  • the laminated sound absorbing material of the present invention is useful for such a noise countermeasure. Further, since the laminated sound absorbing material of the present invention is lighter in weight than a sound absorbing material made of a porous material, glass fiber, or the like, it is possible to reduce the weight and space of the member, and this point is particularly suitable for the automotive field. It is useful as a sound absorbing material.
  • the laminated sound absorbing material of the present invention is a laminated sound absorbing material including at least two fiber layers and a base material layer located between the fiber layers, wherein each fiber layer has an average thickness of 500 nm or more and less than 5 ⁇ m.
  • the base material layer is made of a foamed resin, has a basis weight of 10 to 500 g / m 2 , an air permeability of 950 ⁇ m / Pa ⁇ sec or less, and a thickness of less than 2.9 mm. Having a thickness of 2.9 to 20 mm and a density of 5 to 30 kg / m 3 .
  • the laminated sound-absorbing material of the present invention includes the base layer and the fiber layer, and includes two or more fiber layers, and the base layer is located between the fiber layers.
  • each fiber layer may be a single fiber assembly or a form in which a plurality of fiber assemblies are stacked in one fiber layer.
  • a base material layer is located between the fiber layers.
  • Each substrate layer may be composed of one substrate, or may be in a form in which a plurality of substrates are stacked.
  • the fiber layer and the base material layer included in the laminated sound absorbing material may be one kind each, but may include two or more different kinds of fiber layers or base material layers.
  • a configuration other than the fiber layer and the base material layer may be included.
  • a further fiber layer one layer or two or more layers may be included) outside the range defined in the present invention.
  • the layers of the laminated sound absorbing material may or may not be physically and / or chemically bonded. Some of the plurality of layers of the laminated sound absorbing material may be bonded and some may not be bonded. Adhesion is performed, for example, by heating in the step of forming the fiber layer or as a post-process, melting a part of the fibers constituting the fiber layer, and fusing the fiber layer to the base material layer, thereby bonding the fiber layer and the base material. The layers may be adhered. It is also preferable that an adhesive is applied to the surface of the base material layer or the fiber layer, and the base material layer or the fiber layer is further laminated to bond the layers.
  • the thickness of the laminated sound absorbing material is not particularly limited as long as the effects of the present invention can be obtained.
  • it can be 3 to 50 mm, preferably 3 to 40 mm, and 3 to 30 mm from the viewpoint of space saving. More preferably, it is 30 mm or less.
  • the thickness of the laminated sound absorbing material typically means the total thickness of the fiber layer and the base material layer, and includes the thickness of the portion when an exterior body such as a cartridge or a lid is attached. Make it not exist.
  • the air permeability of the laminated sound absorbing material is not particularly limited as long as the desired sound absorbing performance is obtained, but can be 10 to 1000 ⁇ m / Pa ⁇ s, and preferably 10 to 500 ⁇ m / Pa ⁇ s. If the air permeability is 10 ⁇ m / Pa ⁇ s or more, the sound absorption coefficient does not decrease due to the reflection of sound on the surface of the sound absorbing material, and if the air permeability is 1000 ⁇ m / Pa ⁇ s or less, The maze degree of the sound absorbing material does not decrease, and the energy lost inside the sound absorbing material decreases, so that the sound absorbing coefficient does not decrease.
  • the air permeability of the fiber layer is lower than the air permeability of the base material layer, in other words, a layer having a relatively high air permeability (base material layer) is sandwiched by a layer having a low air permeability (fiber layer).
  • it has a structure.
  • the sound absorbing material which was expected to have a sound insulating performance together with the sound absorbing performance, it is considered that sound is less likely to pass as the air permeability is lower, that is, the sound absorbing material is considered to be effective for the sound insulating property.
  • a fiber layer having a high density and a low air permeability can be obtained by reducing the diameter of the fibers constituting the fiber layer.
  • the air permeability can also be adjusted by a method such as embossing or hot pressing.
  • the air permeability can be measured by a known method, for example, by a Gurley tester method.
  • the laminated sound absorbing material has a laminated structure in which a base material layer is sandwiched between fiber layers.
  • the distance between the fiber layers (also referred to as the thickness of the base layer, the interlayer distance) is preferably 2.9 to 20 mm, and is preferably 2.9 to 15 mm. Is more preferable.
  • the interlayer distance is 2.9 mm or more, the sound absorbing performance in the low frequency region becomes good, and when the interlayer distance is 20 mm or less, the thickness as the sound absorbing material does not become too large, and the sound absorption is excellent in space saving. Wood is obtained.
  • the sound absorbing material of the present invention typically has a structure in which a thick base material layer is sandwiched between a thin fiber layer and a fiber layer, and the thickness of the base material layer is smaller than the thickness of the laminated sound absorbing material. Preferably, it occupies the majority.
  • the fiber layer included in the laminated sound absorbing material of the present invention is a layer made of fibers having an average fiber diameter of 500 nm or more and less than 5 ⁇ m.
  • the layer is made of fibers having an average fiber diameter of 500 nm or more and less than 3 ⁇ m.
  • the fact that the average fiber diameter is 500 nm or more and less than 5 ⁇ m means that the average fiber diameter is within this numerical range.
  • the fiber diameter can be measured by a known method. For example, it is a value obtained by measuring or calculating from an enlarged photograph of the fiber layer surface, and a detailed measuring method will be described in detail in Examples.
  • the fiber layer included in the laminated sound absorbing material of the present invention may be such that one fiber layer is composed of one fiber aggregate, or one fiber layer includes a plurality of fiber aggregates.
  • the superposed body layers may form a single fiber layer.
  • the fiber aggregate means a fiber aggregate that has become one continuous body.
  • the basis weight of the fiber layer is preferably from 10 to 500 g / m 2 , more preferably from 10 to 200 / m 2 . When the basis weight is 10 g / m 2 or more, the control of the flow resistance by the density difference between the fiber layer and the base material layer becomes good, and when the basis weight is less than 500 g / m 2 , the sound absorbing material is excellent in productivity.
  • the thickness of the fiber layer is less than 2.9 mm, and is preferably thinner from the viewpoint of reducing the thickness as a sound absorbing material, preferably less than 2.0 mm, more preferably less than 1.0 mm, and particularly preferably less than 700 ⁇ m. It can be.
  • the air permeability of the fiber layer can be, for example, 950 ⁇ m / Pa ⁇ s or less, and preferably 10 to 600 ⁇ m / Pa ⁇ s.
  • the fiber aggregate constituting the fiber layer is preferably a non-woven fabric, and is not particularly limited as long as it has the fiber diameter and the basis weight in the above-mentioned range, but may be a melt-blown non-woven fabric and / or a non-woven fabric formed by electrospinning. Preferably, there is. According to the melt blown nonwoven fabric, fine fibers can be efficiently laminated on the base material. The details of the melt blown nonwoven fabric will be described in detail in the production method.
  • the resin constituting the fiber layer is not particularly limited as long as the effects of the invention can be obtained.
  • polyolefin resin examples include a polyethylene resin and a polypropylene resin.
  • polyethylene resin examples include low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE).
  • polypropylene resin examples include a homopolymer of propylene, And copolymerized polypropylene obtained by polymerization of ethylene, butene, and the like.
  • the fiber aggregate preferably contains one kind of the above-mentioned resins, and may contain two or more kinds.
  • the fiber may contain various additives other than the resin.
  • additives that can be added to the resin include fillers, stabilizers, plasticizers, pressure-sensitive adhesives, adhesion promoters (eg, silanes and titanates), silica, glass, clay, talc, pigments, colorants, Examples include antioxidants, optical brighteners, antibacterial agents, surfactants, flame retardants, and fluorinated polymers.
  • One or more of the additives may be used to reduce the weight and / or cost of the resulting fibers and layers, adjust the viscosity, or modify the thermal properties of the fibers.
  • various physical properties derived from the properties of the additive may be imparted, including properties relating to electrical properties, optical properties, density, properties relating to liquid barrier or tackiness.
  • the base layer in the laminated sound absorbing material of the present invention has a sound absorbing property and a function of supporting the fiber layer and maintaining the shape of the entire sound absorbing material.
  • the base material layer may be composed of a single-layer base material, or may be in a form in which a plurality of base materials are stacked.
  • the base material constituting the base material layer is not particularly limited as long as the fiber aggregate can be laminated on at least one surface thereof, and a foamed resin can be used.
  • a layer made of a urethane foamed resin or a melamine foamed resin is preferable.
  • One type of substrate may be included in the laminated sound absorbing material, and it is also preferable to include two or more types of substrates. Since it is particularly preferable that these have air permeability, when they have low air permeability, they preferably have openings.
  • the foamed resin is preferably a foamed resin having open cells (communication holes).
  • Examples of the resin constituting the foamed resin layer include a polyolefin resin, a polyurethane resin, and a melamine resin.
  • Examples of the polyolefin resin include homopolymers such as ethylene, propylene, butene-1, or 4-methylpentene-1, and these and other ⁇ -olefins, ie, ethylene, propylene, butene-1, pentene-1, It refers to a random or block copolymer with one or more of hexene-1 and 4-methylpentene-1 or a combination thereof, or a mixture thereof.
  • the base material layer is located between the fiber layers. Further, in addition to being located between the fiber layers, it may be included as a layer located on the outermost surface of the laminated sound absorbing material.
  • the substrate may be composed of only one layer, and it is also preferable that two or more layers are continuously arranged to constitute one substrate layer. By arranging two or more base materials continuously, there is an advantage that the interlayer distance between the layers can be controlled by the thickness of the base material layer.
  • a gas-permeable foamed resin layer can be used as the base material layer, and its density is preferably 5 to 30 kg / m 3 , and more preferably 8 to 26 kg / m 3 .
  • a foamed resin layer having open cells (communication holes) is preferable, and examples thereof include a urethane foamed resin, an acrylic foamed resin, and a melamine foamed resin.
  • the density is 5 kg / m 3 or more, the moldability is good and it is generally available on the market, so it is preferable because it is easily available.
  • the density is 30 kg / m 3 or less, it becomes lightweight as a sound-absorbing material. It is preferable because of high performance.
  • the base material layer has a thickness of 2.9 mm or more.
  • the upper limit of the thickness of the base material layer is not particularly limited, but is preferably 2.9 to 60 mm, more preferably 2.9 to 20 mm from the viewpoint of space saving.
  • the thickness per base material constituting the base material layer can be, for example, 20 ⁇ m to 20 mm, and preferably 30 ⁇ m to 10 mm.
  • the thickness of the substrate is 20 ⁇ m or more, wrinkles do not occur and handling is easy, and the productivity is good.
  • the thickness of the substrate is 20 mm or less, there is no possibility that the space saving property is hindered.
  • the base layer is a layer having a lower density, a higher air permeability and a greater thickness than the fiber layer, and it is considered that this structure reduces sound reflection and contributes to sound absorption.
  • the air permeability of the substrate layer can be, for example, 1000 ⁇ m / Pa ⁇ s or more.
  • various additives such as a coloring agent, an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizing agent, a nucleating agent, a lubricant, and an antibacterial agent are used as long as the effects of the present invention are not impaired.
  • Agents, flame retardants, plasticizers, and other thermoplastic resins may be added.
  • the surface may be treated with various finishing agents, and thereby, functions such as water repellency, antistatic property, surface smoothness, and abrasion resistance may be imparted.
  • the laminated sound absorbing material of the present invention has excellent sound absorbing properties particularly in a low frequency region (frequency region of 1000 Hz or less), a medium frequency region (frequency region of 800 to 2000 Hz), and a high frequency region (frequency region of 2000 to 5000 Hz). It is characterized by.
  • the laminated sound absorbing material of the present invention has excellent sound absorbing properties especially in the region of 400 Hz to 1000 Hz, and exhibits different sound absorbing characteristics from the conventional sound absorbing materials.
  • the laminated sound absorbing material of the present invention controls the flow resistance of sound waves by utilizing the density difference between the fiber layer and the base material layer, and utilizes the transmission and reflection of sound waves and interference. As a result, it is considered that a performance is obtained in which the thickness is small and the absorptivity in the low frequency region and the middle frequency region is excellent.
  • the method for evaluating sound absorption is described in detail in Examples.
  • the method for producing the laminated sound absorbing material is not particularly limited, for example, a step of forming a fiber layer that forms one fiber aggregate on one base material layer, and a plurality of fiber layers in a predetermined order and number And a step of superimposing and integrating them.
  • a layer other than the fiber layer for example, a further base material layer
  • the foam used as the base layer may be manufactured and used by a known method, or a commercially available foam may be selected and used.
  • the method of laminating the two-layered laminate of the base material layer / fiber layer obtained as described above and integrating a plurality of the laminates is not particularly limited.
  • various bonding methods that is, thermocompression bonding using a heated flat roll or embossing roll, bonding using a hot melt agent or a chemical adhesive, thermal bonding using circulating hot air or radiant heat, and the like can also be adopted. From the viewpoint of suppressing the deterioration of the physical properties of the fiber layer, heat treatment using circulating hot air or radiant heat is particularly preferable.
  • thermocompression bonding using flat rolls or embossing rolls there is a possibility that the fiber layer will be melted and formed into a film, or the area around the embossing point will be damaged or damaged, making stable production difficult. In addition, performance degradation such as a reduction in sound absorption characteristics is likely to occur.
  • the component may fill the inter-fiber voids of the fiber layer, which may easily cause performance deterioration.
  • heat treatment using circulating hot air or radiant heat it is preferable because damage to the fiber layer is small and integration can be performed with sufficient delamination strength.
  • ⁇ Average fiber diameter> The fibers were observed using a scanning electron microscope SU8020 manufactured by Hitachi High-Technologies Corporation, and the diameter of 50 fibers was measured using image analysis software. The average value of the fiber diameters of 50 fibers was defined as the average fiber diameter.
  • ⁇ Sound absorption measurement 1> A sample having a diameter of 63 mm was collected from each laminate, laminated under each condition, and then subjected to a test specimen at a frequency of 200 to 3200 Hz in accordance with ASTM E 1050 using a vertical incidence sound absorption coefficient measuring apparatus “TYPE 4206 manufactured by Brüel & Kear”. The vertical incidence sound absorption coefficient when a plane sound wave is vertically incident on the sample was measured.
  • ⁇ Sound absorption in low frequency range> When the sound absorption coefficient at a frequency x of 200 to 3200 Hz is measured at 1 Hz intervals, and the obtained curve is f (x), an integrated value S at 200 to 1000 Hz is obtained by the following equation.
  • ⁇ Sound absorption coefficient measurement 2> A sample having a diameter of 40 mm was collected from each laminate and laminated under each condition. Then, a test specimen at a frequency of 200 to 5000 Hz was measured using a vertical incidence sound absorption coefficient measuring apparatus “WinZacMTX manufactured by Nippon Acoustic Engineering Co., Ltd.” in accordance with ASTM E1050. The vertical incidence sound absorption coefficient when a plane sound wave is vertically incident on the sample was measured.
  • Air permeability> The air permeability was measured using a Gurley densometer (model: GB-3C) manufactured by Toyo Seiki Seisaku-Sho, Ltd. in accordance with ISO 5636.
  • the MFR of the polypropylene resin is a value measured at 230 ° C. under a load of 2160 g according to JIS K 7210 (1999).
  • the MFR of the polyethylene resin is a value measured at 190 ° C. under a load of 2160 g under JIS K 7210 (1999).
  • Example 1 For forming the fiber layer, two extruders having a screw (50 mm diameter), a heating element and a gear pump, and a spinneret for fiber mixing (a hole diameter of 0.3 mm, a hole through which resin is alternately discharged from the two extruders)
  • a nonwoven fabric manufacturing apparatus including a compressed air generator, an air heater, a collecting conveyor equipped with a polyester net, and a winder, in which several 501 holes are arranged in a line, was used.
  • the two types of polypropylene resin are put into two extruders of the manufacturing apparatus, the extruder is set at 240 ° C. to heat and melt the resin, and the mass ratio of the gear pump is set to 50/50, and the spinning is performed.
  • the molten resin was discharged from the die at a spinning speed of 0.3 g / min per single hole.
  • the discharged fibers were sprayed onto the collection conveyor at a distance of 30 cm from the spinneret by compressed air of 98 kPa (gauge pressure) heated to 400 ° C. to form a fiber layer.
  • the basis weight was arbitrarily set by adjusting the speed of the collecting conveyor.
  • the average fiber diameter was 1.8 ⁇ m
  • the basis weight of the fiber layer was 80 g / m 2
  • the thickness was 0.6 mm.
  • a base material D was Calmflex F-2 (density: 25 kg / m 3 ), a commercially available urethane foam resin material, manufactured by Inoac Corporation, having a density of 25 kg / m 3 .
  • the obtained base material D and the fiber layer were superposed so as to be a fiber layer / base material layer D / fiber layer, and cut out into a 63 mm-diameter circle to prepare a sample for sound absorption coefficient measurement.
  • the normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated.
  • the sound absorbing property (integral value T at 800 to 2000 Hz) in the middle frequency range was evaluated and found to be 996, which was good.
  • a circular sample having a diameter of 40 mm was cut out to produce a high-frequency sound absorption evaluation sample. When the sound absorption in the high frequency region (integral value U of 2000 to 5000 Hz) was evaluated, it was 2534, which was good.
  • a base material E was a commercially available urethane foam resin material, Calmflex F-2 (density: 25 kg / m 3 ) manufactured by Inoac Corporation and having a thickness of 15 mm.
  • Calmflex F-2 density: 25 kg / m 3
  • they were superposed so as to be a fiber layer / base material layer E / fiber layer, and cut out into a 63 mm diameter circle to obtain a sample for sound absorption coefficient measurement. Created.
  • the normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated.
  • a base material F was a commercially available melamine foamed resin material, Basotect BAF-10G + (density: 9.2 kg / m 3 ), manufactured by Inoac Corporation and having a thickness of 10 mm.
  • Basotect BAF-10G + density: 9.2 kg / m 3
  • they were superposed so as to be a fiber layer / base material layer F / fiber layer, cut out into a 63 mm diameter circle, and a sound absorption coefficient measurement sample was obtained. Created. The normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integral value S at 200 to 1000 Hz) was evaluated.
  • Example 4 A base material G was cut out from a commercially available melamine foamed resin material, Basotect BAF-20G + (density: 9.2 kg / m 3 ), manufactured by Inoac Corporation, to a thickness of 15 mm. Using the obtained base material G and the fiber layer obtained in Example 1, they were superposed so as to be a fiber layer / base material layer G / fiber layer, and cut out into a 63 mm-diameter circle to prepare a sample for sound absorption coefficient measurement. did. The normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated.
  • Basotect BAF-20G + density: 9.2 kg / m 3
  • Example 1 The same procedure as in Example 1 was carried out except that only two fiber layers were used. The layers were laminated so as to be a fiber layer / fiber layer, cut out into a 63 mm diameter circle, and a sample for sound absorption coefficient measurement was prepared. The normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated. When the sound absorbing property (integral value T of 800 to 2000 Hz) in the middle frequency range was evaluated, it was 897, which was good. When the sound absorption in the high frequency region (integral value U of 2000 to 5000 Hz) was evaluated, it was 2294, which was good.
  • Example 3 Only the substrate layer D obtained in Example 1 was cut into a circular shape having a diameter of 63 mm to prepare a sample for sound absorption coefficient measurement. The normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated to be 131. It was 408 when the sound absorption property (integral value T of 800 to 2000 Hz) in the middle frequency region was evaluated. A circular sample having a diameter of 40 mm was cut out to produce a high-frequency sound absorption evaluation sample. It was 2102 when the sound absorption property (integral value U of 2000 to 5000 Hz) in the high frequency region was evaluated.
  • Example 5 Only the substrate layer D and one fiber layer of Example 3 were laminated so as to be the substrate layer D / fiber layer, and cut into a 63 mm diameter circle to prepare a sample for sound absorption coefficient measurement.
  • the normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated. It was 741 when the sound absorption property (integral value T of 800 to 2000 Hz) in the middle frequency range was evaluated.
  • a circular sample having a diameter of 40 mm was cut out to produce a high-frequency sound absorption evaluation sample. It was 2653 when the sound absorption property (integral value U of 2000 to 5000 Hz) in the high frequency region was evaluated.
  • Example 6 Only the substrate layer F and one fiber layer of Example 3 were laminated so as to become the substrate layer F / fiber layer, and cut into a 63 mm diameter circle to prepare a sample for sound absorption coefficient measurement.
  • the normal incidence sound absorption coefficient was measured, and the sound absorption in the low frequency region (integrated value S at 200 to 1000 Hz) was evaluated. It was 720 when the sound absorption property (integral value T of 800 to 2000 Hz) in the middle frequency region was evaluated.
  • a circular sample having a diameter of 40 mm was cut out to produce a high-frequency sound absorption evaluation sample. It was 2707 when the sound absorption property (integral value U of 2000 to 5000 Hz) of the high frequency region was evaluated.
  • Table 1 shows a summary of Examples 1 to 4 and Comparative Examples 1 to 6.
  • the laminated sound absorbing materials of Examples 1 to 4 of the present invention were all excellent in low frequency sound absorbing property, medium frequency sound absorbing property, high frequency sound absorbing property, and space saving property.
  • Comparative Example 1 which was composed of only two fiber layers without sandwiching the base material layer, was excellent in middle-frequency sound absorption, but was insufficient in low-frequency sound absorption.
  • Comparative Example 2 which was a single-layer sound absorbing material composed of only relatively small diameter fibers, had insufficient low frequency sound absorbing properties and medium frequency sound absorbing properties even when the thickness was increased.
  • the laminated sound absorbing material of the present invention is particularly excellent in sound absorbing properties in a low frequency range to a medium frequency range and a high frequency range, it can be used as a sound absorbing material in a field where noise in a low frequency range to a medium frequency range is a problem.
  • a sound absorbing material used for ceilings, walls, floors, etc. of houses a sound insulating wall such as an expressway or a railway line, a sound insulating material of home electric appliances, a sound absorbing material arranged in each part of a vehicle such as a railway or an automobile, etc. Can be used.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

L'invention a pour objectif de fournir un matériau insonorisant mince qui présente d'excellentes propriétés d'absorption sonore dans une plage basse fréquence, une plage de fréquence intermédiaire et une plage haute fréquence. À cet effet, l'invention concerne un matériau insonorisant stratifié qui comprend au moins deux couches de fibres et une couche de matériau de base qui se trouve entre les couches de fibres. Les couches de fibres comprennent des fibres ayant un diamètre de fibre moyen d'au moins 500 nm mais inférieur à 5 µm. Les couches de fibres ont un poids de base de 10–500 g/m2 et une perméabilité à l'air ne dépassant pas 950 µm/Pa∙sec, et sont inférieures à 2,9 mm d'épaisseur. La couche de matériau de base comprend une résine de mousse, a une épaisseur de 2,9 à 20 mm et possède une densité de 5–30 kg/m3.
PCT/JP2019/029060 2018-07-31 2019-07-24 Matériau insonorisant stratifié WO2020026923A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0711716A (ja) * 1993-06-25 1995-01-13 Toray Ind Inc 透湿・防水性シート
JP2006240207A (ja) * 2005-03-07 2006-09-14 Toray Ind Inc 難燃防音材
JP2017037173A (ja) * 2015-08-10 2017-02-16 東レ株式会社 吸音フェルト

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0711716A (ja) * 1993-06-25 1995-01-13 Toray Ind Inc 透湿・防水性シート
JP2006240207A (ja) * 2005-03-07 2006-09-14 Toray Ind Inc 難燃防音材
JP2017037173A (ja) * 2015-08-10 2017-02-16 東レ株式会社 吸音フェルト

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